In this paper, we revisit [1]} and consider the procedure outlined
there more generally and in more detail. In particular, we present a
detailed study of a BRST and anti-BRST covariant formulation of the
\(\mathcal {N} = 0\)  theory. We show that the 2-form gauge invariance may
be neatly treated using the superspace method developed in
[2]}, [3]}. The BRST and anti-BRST Lagrangian is
then constructed by adding to the original gauge-invariant Lagrangian a
gauge-fixing contribution that is by construction BRST and anti-BRST
invariant. One of the facts that we emphasise in this work is that because
the inverse of the d'Alembertian operator may be used freely, this means
that the source term is in principle ambiguous in the sense that there
is some freedom to choose which terms are taken to be contributing to
the \({\cal N}=0\)  supergravity sources and which terms
are not. This is particularly important when dealing with explicit
solutions.
